[PATCH v3 1/7] trace2: cleanup column alignment in perf target format

["Jeff Hostetler via GitGitGadget" <gitgitgadget@gmail.com>]

From: Jeff Hostetler <jeffhost@microsoft.com>

Truncate/elide very long "filename:linenumber" field.
Truncate region and data "category" field if necessary.
Adjust overall column widths.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
---
 trace2/tr2_tgt_perf.c | 39 +++++++++++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 10 deletions(-)

diff --git a/trace2/tr2_tgt_perf.c b/trace2/tr2_tgt_perf.c
index ea0cbbe13e..4a9d99218b 100644
--- a/trace2/tr2_tgt_perf.c
+++ b/trace2/tr2_tgt_perf.c
@@ -21,10 +21,10 @@ static struct tr2_dst tr2dst_perf = { TR2_SYSENV_PERF, 0, 0, 0 };
  */
 static int tr2env_perf_be_brief;
 
-#define TR2FMT_PERF_FL_WIDTH (50)
+#define TR2FMT_PERF_FL_WIDTH (28)
 #define TR2FMT_PERF_MAX_EVENT_NAME (12)
-#define TR2FMT_PERF_REPO_WIDTH (4)
-#define TR2FMT_PERF_CATEGORY_WIDTH (10)
+#define TR2FMT_PERF_REPO_WIDTH (3)
+#define TR2FMT_PERF_CATEGORY_WIDTH (12)
 
 #define TR2_DOTS_BUFFER_SIZE (100)
 #define TR2_INDENT (2)
@@ -79,17 +79,36 @@ static void perf_fmt_prepare(const char *event_name,
 
 	if (!tr2env_perf_be_brief) {
 		struct tr2_tbuf tb_now;
+		size_t fl_end_col;
 
 		tr2_tbuf_local_time(&tb_now);
 		strbuf_addstr(buf, tb_now.buf);
 		strbuf_addch(buf, ' ');
 
-		if (file && *file)
-			strbuf_addf(buf, "%s:%d ", file, line);
-		while (buf->len < TR2FMT_PERF_FL_WIDTH)
+		fl_end_col = buf->len + TR2FMT_PERF_FL_WIDTH;
+
+		if (file && *file) {
+			struct strbuf buf_fl = STRBUF_INIT;
+
+			strbuf_addf(&buf_fl, "%s:%d", file, line);
+
+			if (buf_fl.len <= TR2FMT_PERF_FL_WIDTH)
+				strbuf_addbuf(buf, &buf_fl);
+			else {
+				size_t avail = TR2FMT_PERF_FL_WIDTH - 3;
+				strbuf_addstr(buf, "...");
+				strbuf_add(buf,
+					   &buf_fl.buf[buf_fl.len - avail],
+					   avail);
+			}
+
+			strbuf_release(&buf_fl);
+		}
+
+		while (buf->len < fl_end_col)
 			strbuf_addch(buf, ' ');
 
-		strbuf_addstr(buf, "| ");
+		strbuf_addstr(buf, " | ");
 	}
 
 	strbuf_addf(buf, "d%d | ", tr2_sid_depth());
@@ -102,7 +121,7 @@ static void perf_fmt_prepare(const char *event_name,
 		strbuf_addf(buf, "r%d ", repo->trace2_repo_id);
 	while (buf->len < len)
 		strbuf_addch(buf, ' ');
-	strbuf_addstr(buf, "| ");
+	strbuf_addstr(buf, " | ");
 
 	if (p_us_elapsed_absolute)
 		strbuf_addf(buf, "%9.6f | ",
@@ -116,8 +135,8 @@ static void perf_fmt_prepare(const char *event_name,
 	else
 		strbuf_addf(buf, "%9s | ", " ");
 
-	strbuf_addf(buf, "%-*s | ", TR2FMT_PERF_CATEGORY_WIDTH,
-		    (category ? category : ""));
+	strbuf_addf(buf, "%-*.*s | ", TR2FMT_PERF_CATEGORY_WIDTH,
+		    TR2FMT_PERF_CATEGORY_WIDTH, (category ? category : ""));
 
 	if (ctx->nr_open_regions > 0) {
 		int len_indent = TR2_INDENT_LENGTH(ctx);
-- 
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